The original HET entered service with the US Army in 1993 using a 500hp Detroit Diesel engine. It was designed to transport 70 tonne of armoured fighting vehicles, which included the M1A1 Abrams tank or x2 Bradleys or other Combat Engineer Vehicle. Unlike a lot of transports, the HETS has an off-road capability.

The Oshkosh Defense 1070F HET For British Army

The British Army eavy Equipment Transporter HET 1070F was a European model of the HET M1070 tractor (meets European exhaust mission standards) and a technologically advanced trailer designed and built by King Trailers Limited of Market Harborough, Leicestershire, U.K

The order was placed in January 2001. The King Trailer seven-axle, hydraulic-suspension steering trailer is specifically designed to operate with the Oshkosh M1070 to carry battle tanks weighing up to 158,731 pounds (72 metric tons) or two lighter armored vehicles. 157 HT 1070F are in service.

The Oshkosh Defense Global HET

This was the next version of HET and is 6×6 (not 8×8 like HET M1070) that was unveiled in October 2008.

The Oshkosh Defense Heavy Equipment Transporter HET A1

The HET A1 aka HETA1 aka M1070A1 development started in early 2008. The HET A1 program includes improvements to the power train including the engine, transmission, transfer case and electrical systems. The next-generation HET also will incorporate improved axles and wheels, a new hood and cab improvements consisting of improved seats, dash panel, electrical, air conditioning and additional support for future armor upgrades.

The first production M1070A1 was completed in December 2010 following an order for 200 in October. The vehicle retains the M1000 semi-transporter trailer.

U.S. Army – Entering service since 1993, over 2600 vehicles are in service, both HET M1070 & M1070A1.

United Kingdom – Entering service in 2001, replacing the Scammel Commander, the British Army version has modifications to the cab and engine to meet exhaust emission European legislation. British Army HET’s are designated HET 1070F.